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6.0 TROUBLESHOOTING
26
SYMPTOM
Low operating pressure
Low permeate flow rate
POSSIBLE CAUSES
Insufficient feed water pressure
or flow
Clogged pre-filter cartridge
High flow rates
Dirty or fouled membrane
elements
Solenoid valve not opening
Pump rotating backwards
(three-phase power only)
Insufficient electrical power
Pump not operating correctly
Low operating pressure
REMEDIES
Open the feed pressure, open the
feed water valve, check for
restrictions.
Replace the pre-filter cartridge.
Close the concentrate valve,
check the permeate and concen-
trate flow rates and adjust if nec-
essary. Excessive permeate flow
may indicate a damaged O-ring.
Flush and clean the membrane
elements.
Clean or replace the solenoid
valve.
Switch any two of the three-
phase leads to the motor starter.
Check the fuses or circuit break-
er, measure the voltage.
See the pump instructions.
See the possible causes for low
pressure.
TROUBLESHOOTING GUIDE